Possibilities are there for that to happen because the value of the bitcoin is based on demand and supply so if the people stop using bitcoin then the price will starts to decrease.But the chances of happening this is low because bitcoin already got good support from the world people.
I cannot accept the possibilities you have mentioned. Because in this world, each and everything comes with its own risks hence bitcoin is not an exception. Compared to any other existing system, I believe bitcoin must have less possibilities to get disappeared.
Demand for bitcoins and adoption of bitcoins to a large extent are the things that I see happening. So far, we are still very low on adoption, and there is nothing really that could fuel it, but as we keep growing and heading gradually to the mainstream with regulations, I see a lot of adoption taking place and I presume it to be a massive one. People may be looking at the present picture now, but for some of us, the picture in the future is far bigger.